<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Page Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
    <script>
        var s1 = "123123"
        var s2 = {
            'a':1123,
            'b':33333
        }
        var s3 = "asjd"
        var s4 = "123asd"
        var s5 = "12.02"
        console.log(+s1);
        console.log(+s2);
        console.log(+s3);
        console.log(+s4);
        console.log(new Date().getTime());
        console.log(s2 && +0);
        console.log(1 && 2);
        console.log(true && false);
        console.log(-1);
    </script>
</body>
</html>